Allometry of phloem thickness and resin flow and their relation to tree chemotype in a southwestern ponderosa pine forest

Thomas S. Davis, Richard Hofstetter

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We measured traits of 470 Pinus ponderosa in northern Arizona and constructed equations scaling phloem thickness and resin flow to tree size. We tested the hypothesis that these traits were related to tree monoterpene chemotype. The monoterpene composition of resin was analyzed for a subset of trees (n = 146). Correlation analyses revealed that all tree phenotypic traits were positively correlated. Equations of phloem thickness and resin flow were nonlinear: phloem thickness was a logarithmic function of tree diameter, and diameter explained moderate variation in phloem thickness (R2 = 0.234). Similarly, resin flow was a reciprocal function of diameter (R2 = 0.214). Resin flow rapidly increased with tree diameter but plateaued as tree diameter exceeded 40 cm. Phloem thickness was only weakly linearly related to resin flow (R2 = 0.078). A multivariate regression incorporating diameter, height, and phloem thickness did not explain substantially more variance in resin flow than diameter alone. We found no evidence to suggest that tree phenotype was related to tree chemotype. We conclude that there are positive but weak relationships between tree size, phloem thickness, and resin flow in southwestern ponderosa pine and that trees with thick phloem are not necessarily better defended from herbivory by resin flow.

Original languageEnglish (US)
Pages (from-to)270-274
Number of pages5
JournalForest Science
Volume60
Issue number2
DOIs
StatePublished - 2014

Fingerprint

phloem
chemotypes
allometry
Pinus ponderosa
coniferous forests
resins
resin
tree and stand measurements
monoterpene
monoterpenoids
herbivory
herbivores
phenotype

Keywords

  • Conifer
  • Oleoresin
  • Terpenoids
  • Tree traits
  • Vascular tissue

ASJC Scopus subject areas

  • Forestry
  • Ecological Modeling
  • Ecology

Cite this

Allometry of phloem thickness and resin flow and their relation to tree chemotype in a southwestern ponderosa pine forest. / Davis, Thomas S.; Hofstetter, Richard.

In: Forest Science, Vol. 60, No. 2, 2014, p. 270-274.

Research output: Contribution to journalArticle

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